Cannon-pinion for watches



(No Model.)

J. S. 85 A. J. BAKER.

CANNON PINION FOR WATCHES.

No. 543,325. Patented July 23,1895.

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JACOB S. BAKER, OF GLEN ROCK, AND ALLEN J. BAKER, OF STEIVARTSTOVVN,PENNSYLVANIA.

CANNON-PINION FOR WATCHES.

SFECIFIGATION forming part of Letters Patent No. 543,325, dated July 23,1895. Application filed April 9, 1895. $erial No. 545,055. (No model.)

To aZZ whom it) may concern:

Be it known that we, JAooB S. BAKER, residing at Glen Rock, and ALLEN J.BAKER, residing at Stewartstown, in the county of York and State ofPennsylvania, have invented certain new and useful Improvements inCannon- Pinions for Timepieces, of which the following is aspecification.

Our invention relates to an improvement in to securing the cannon-pinionto the center arbor of timepieces.

The object of the invention is to provide for a definite degree offriction between the cannon-pinion and the center arbor, on which it ismounted, in order to prevent the hands of the timepiece from becomingloose.

The invention is applicable to both clocks and watches.

The invention is illustrated in the accom- 2o panying drawings, inwhich- Figure 1 is an elevation of the center arbor, wheel, and pinion,asection of the cannonpinion, and shows the friction device interposedbetween the center arbor and cannon- 2 5 pinion. Fig. 2 shows the centerarbor, wheel,

and pinion. Fig. 3 is a side View of the cannon-pinion and the improvedfriction device partly inserted into the same. Fig. 4 is a top View ofthe nut. Fig. 5 is a side View of the 0 parts shown in Fig. 1. Fig. 6shows a modification in which the friction device and nut are in oneintegral piece. l

The letter A designates the center arbor, b the center wheel, and c thecenter pinion. The

3 5 end Cl of the center arbor whereon the cannonpinion e is placed istapered, as shown.

The improved friction device consists of a partly-split sleeve f, whichtakes on the tapered end (1 of the center arbor and is inter- 0 posedbetween the bore of the cannon-pinion and said arbor. The sleeve or tubef in Figs. 1 and 3 has at its top end a slight lateral or outward flangef, at its lower end a slight contraction or inward-curved flange f and a5 longitudinal split f which splits the said lower end. Thus constructedthe partly-split sleeve may be pulled apart a little at its split endand act as a spring, so as to remain nor mally sprung open. Theextremity of the tapered part of the center arbor has a screwthread g,and a nut h is employed to take thereon.

The parts are assembled in the following manner: The split end of thesleevefis first inserted into the bore of the cannon-pinion e, 5 5 asindicated in Fig. 3. This pinion,with the friction-sleeve within it, isthen placed on the tapered end cl of the center arbor, with the eifectthat the lower end f of the sleeve is made to grip the arbor, and as thepinion and 6a sleeve are forced on the arbor the taper of the latterspreads or expands the sleeve and causes its exterior to fill the boreof the cannon-pinion, thus producing a degree of friction which preventsthe cannon-pinion from turning freely or loosely. As the cannon-pinioncannot with this friction device remain motionless while the movement ofthe timepiece is running, the hands are sure to turn. The cannon-pinionand split sleeve are both retained on the center arbor by a suitablescrew device. In the present instance a nut his employed to engage thethreaded end of the center arbor.

We may modify the form of our invention 7 in some of its details, asshown, for instance, in Fig. 6, where we have united the split sleeveand the nut so that the nut is integral with the upper end of saidsleeve.

Having thus described our invention, what we claim as new, and desire tosecure by Letters Patent, is

The center arbor; a sleeve 011 the arbor and split at one end; a cannonpinion around said split sleeve; and a screw device engaging the 8extremity of the arbor to retain both the cannon pinion and sleeve.

In testimony whereof we affix our signatures in the presence of twowitnesses.

JACOB S. BAKER. ALLEN J. BAKER.

Witnesses:

CHARLES B. MANN, J r., O. CALVERT HINns.

